Labasa

Overview

Following the Sakoca project, Wood & Jepsen Consultants (WJC) requested an aerial survey be performed on two sites in Labasa, Vunika and Vunivau. The Sakoca project showed using drones provided a huge reduction in time spent gathering data, and more detailed data than traditional methods. The purpose of this project was to provide those same benefits. 

We were tasked with performing the initial site investigation survey, and with delivering:

  • Geotagged high resolution aerial imagery

  • 0.1 m contours of the terrain

  • Digital Terrain Model

Solution

Capturing Aerial Images

Flights were conducted over both sites using a senseFly eBee drone. GCPs were placed by Kahuto, and the GCP coordinates were gathered by Wood and Jepsen.

Vunika flight details

Area size: 0.77 km²

GSD: 4 cm/pixel

Number of photos: 280

Altitude: 170 m

Total flight time:  33 minutes

Vunivau flight details

Area size: 2.25 km²

GSD: 6 cm/pixel

Number of photos: 800

Altitude: 255 m

Total flight time: 2 hours

Processing

 

Processing was done with Pix4D using the following coordinate

systems:

  • Image Coordinate System: WGS84

  • GCP Coordinate System: Fiji 1986 / Fiji Map Grid (egm84)

  • Output Coordinate System: Fiji 1986 / Fiji Map Grid (egm84)

In order to create an accurate DTM and contours, the point cloud created in Pix4D was manually classified to remove vegetation, buildings, cars, etc. 

Vunika point cloud

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info@kahutopacific.com

Tel: +679 331 0949

Unit 1, Level 2

Carnarvon Street, Carnarvon Building 

Suva, Fiji 

© 2019 by Kahuto Pacific.